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Loans Payable - Summary of Significant Conversion Option Valuation Inputs and Results (Detail) - After Modification [Member] - Binomial Lattice Process [Member] - Share Purchase Options Classified in Equity [Member] | 12 Months Ended
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Dec. 31, 2017 $ / shares
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Underlying price on valuation date | $ 1.25
Contractual conversion rate | $ 1.00
Contractual term to maturity | 1 year 9 months 26 days
Implied expected term to maturity | 1 year 9 months 26 days
Market volatility: |
Equivalent volatilities | 120.10%
Equivalent market risk adjusted interest rates | 0.52%
Minimum [Member] |
Market volatility: |
Range of volatilities | 96.00%
Risk free rates using zero coupon US Treasury Security rates | 0.29%
Maximum [Member] |
Market volatility: |
Range of volatilities | 154.00%
Risk free rates using zero coupon US Treasury Security rates | 0.68%

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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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